Crown boiler error codes

The trademark Crown exists on the market from the 1958. There are boilers among its range of products. Crown’s marketing strategy involves not only supply of quality products on the market, including boilers, but also first-class services. The part of the Crown services is to provide customers with the opportunity to identify any malfunction of their equipment. Below you can find a table with Crown boiler error codes.

Crown Boiler BWC Series boiler error codes

CODE	CONDITION	POSSIBLE CAUSES
b 08	Pressure switch circuit open	• Blockage in intake or vent system.
		• Vent and/or intake system not constructed in accordance with Part VI.
		• Blocked or leaking pressure switch tubing
		• Heat exchanger or burner blockage
		• Terminals exposed to high winds
		• Blockage in condensate trap above vent.
b 18	MCBA supply sensor detected temperatures in excess of 200°F	• Heating load at time of error was far below the minimum firing rate of the boiler
		• Defective primary pump or no flow in primary loop (Piping Method 1)
		• Control system miswired so that boiler operation is permitted when no zones are calling
b 19	MCBA return sensor detected temperatures in excess of 200° F	• See possible causes for ub18"
		• Flow through boiler reversed
		• Sensor wiring reversed
b 24	MCBA is reading a return sensor temperature higher than the supply sensor temperature. Condition must be present for at least 75s for this error code to appear.	• Flow through boiler reversed. Verify correct piping and pump orientation.
		• No boiler water flow. Verify that system is purged of air and that appropriate valves are open.
		• Sensor wiring reversed.
		• Supply or return sensor defective.
b 25	Supply water temperature has risen too quickly	• See possible causes for ub18"
		• Inadequate boiler water flow. Verify that pump is operating and that pump and piping are sized per Part VIII of this manual
b 26	Boiler safety limit, or external limit wired across terminals 3&4. is open.	• See possible causes for ub18"
		• Defective supply sensor.
b 30	Temperature rise between supply and return is too high.	• Inadequate boiler water flow. Verify that pump is operating and that pump and piping are sized per Part VIII of this manual
b 61	Pressure switch circuit closed with fan off	• Blockage in pressure switch hose
		• Pressure switch wires shorted together
		• Defective pressure switch
		• Loose or miswired fan speed harness (if “b61" error code is observed while fan is running)
b 65	Fan is not achieving set point speed	• Loose or incorrect fan speed control connection
		• Defective fan
E 00	A flame signal was present when there should be no flame.	• Defective gas valve - make sure inlet pressure is below maximum on rating plate before replacing valve.
E 02	Flame failure after 5 tries to restart	• No gas pressure
		• Gas pressure under minimum value shown on rating plate
		• Gas line not completely purged of air
		• Defective Electrode
		• Loose burner ground connection
		• Defective Ignition Cable
		• Loose or defective gas valve harness
		• Defective gas valve (check for 24 VDC at harness during trial for ignition before replacing valve)
		• Air-fuel mixture out of adjustment - consult factory
		• Blockage in vent system or heat exchanger (BWC 150 Only)
		• Blocked condensate trap (BWC 150 Only)
E 03	Internal control failure	• Reset the control. If problem reoccurs, replace the MCBA.
E 04	Power failure occurred after lockout	• Some other error on this list occurred and power to the boiler was then interrupted. Reset control and see if hard lockout reoccurs.
E 05, E 06, E 07, E 11	Internal control failure	• Reset the control. If problem reoccurs, replace the MCBA.
E 12	Low water cut-off circuit open	• If yellow light on LWCO is on, system is low on water
		• If neither yellow nor green light is on, check LWCO harness and check for 24VAC across AT 140 transformer
E 13, E 14, E 15, E 16, E 17	Internal control failure	• Reset the control. If problem reoccurs, replace the MCBA.
E 18	MCBA supply sensor detected temperatures in excess of 200°F for an extended period of time	• See possible causes for “b18" error. Also, check safety limit for proper operation.
E 19	MCBA return sensor detected temperatures in excess of 200°F for an extended period of time	• See possible causes for “b19" error.
E 28	Blower is not running when it should or fan speed signal not being detected by MCBA	• Loose connection in 120 VAC fan wiring
		• Loose or miswired fan speed harness
		• Defective fan
E 29	Blower fan speed has not returned to zero rpm	• Miswired fan speed harness
		• Defective fan
E 31	Shorted supply temperature sensor	• Shorted or miswired supply sensor wiring
		• Defective supply sensor
E 32	Shorted return temperature sensor	• Shorted or miswired return sensor wiring
		• Defective return sensor
E 35	Flue gas temperature sensor short circuit	• Shorted or miswired flue temp sensor wiring
		• Defective flue temp sensor

Crown Boiler PHNTM399 boiler error codes

Indication	Condition	Possible Cause
Display Completely Dark	No 120Vac Power at Boiler	Check breaker and wiring between breaker panel and boiler.
Fan off, LWCO lights off, no green power light on Control
Display Completely Dark, Fan running	No 24Vac Power to Control	- Loose 120Vac connection wiring between boiler J-Box and transformer
		- Loose 24 Vac connection wiring between transformer and Control.
Blinking Green power light on Control	Control Fault	- The green light is connected to internal power supply. The power supply is repeatedly starting and stopping (not normal) making the light flash. The microprocessors are not running.
		- Try disconnecting all terminals except 24VAC to power the Control. The green light should be steady. If it is not, then the control is defective. If steady, start plugging in all the connectors while watching the green light. When faulty wiring reconnected, green light will begin to flash.
Display Completely Dark but Boiler fires	No 5 Vdc Power to Display	- Loose 5 Vdc connection wiring between display and Control
		- Defective Display or Control.
00FF or ERFF	display lost communication with control	- Loose or defective display harness
		- Defective Display
		- Defective Control
ER0011	Adjustment Mode Password Timeout	- The Control and Display are NOT defective. The password has timed out. Simply cycle power to the Display to restore operation.
ER0012	Control Failed	- Defective Control. Replace Boiler Control.